| Value | Category |
|---|---|
| -9 | don't know |
| -8 | refused to answer |
| -7 | not applicable |
| -6 | still in process |
| -5 | application denied |
| -4 | skipped |
| -3 | not provided |
| 1 | 0-3 years of education |
| 2 | 4-6 years of education |
| 3 | 7-12 years of education |
| 5 | 13 years and above of education |
| Sysmiss |